Enhanced energy coupling by using structured nano-wire targets H. Habara, Y. Mishima, N. Nakanii, S. Honda, M. Katayama, L. Gremillet, L. Willingale, A. Maksimchuk, K. Krushelnick and K.A. Tanaka EPJ Web of Conferences, 59 (2013) 17007 Published online: 15 November 2013 DOI: 10.1051/epjconf/20135917007